/*
 * Copyright (C) 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.anjoyo.anjoyosafety.decoding;

import java.util.Hashtable;

import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;

import com.anjoyo.anjoyosafety.activity.CodeMainActivity;
import com.anjoyo.anjoyosafety.camera.CameraManager;
import com.anjoyo.anjoyosafety.camera.PlanarYUVLuminanceSource;
import com.anjoyo.anjoyosatety.activity.R;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;

final class DecodeHandler extends Handler {

  private static final String TAG = DecodeHandler.class.getSimpleName();

  private final CodeMainActivity activity;
  private final MultiFormatReader multiFormatReader;

  DecodeHandler(CodeMainActivity activity, Hashtable<DecodeHintType, Object> hints) {
    multiFormatReader = new MultiFormatReader();
    multiFormatReader.setHints(hints);
    this.activity = activity;
  }

  @Override
  public void handleMessage(Message message) {
    switch (message.what) {
      case R.id.decode:
        //Log.d(TAG, "Got decode message");
        decode((byte[]) message.obj, message.arg1, message.arg2);
        break;
      case R.id.quit:
        Looper.myLooper().quit();
        break;
    }
  }

  /**
   * Decode the data within the viewfinder rectangle, and time how long it took. For efficiency,
   * reuse the same reader objects from one decode to the next.
   *
   * @param data   The YUV preview frame.
   * @param width  The width of the preview frame.
   * @param height The height of the preview frame.
   */
  private void decode(byte[] data, int width, int height)
  {
      long start = System.currentTimeMillis();
      Result rawResult = null;
      /**
       * 将相机获取的图片数据转化为binaryBitmap格式
       */
     // PlanarYUVLuminanceSource source = CameraManager.get()
      //        .buildLuminanceSource(data, width, height);
      byte[] rotatedData = new byte[data.length];  
      for (int y = 0; y < height; y++) {  
          for (int x = 0; x < width; x++)  
          rotatedData[x * height + height - y - 1] = data[x + y * width];  
      }  
      int tmp = width; // Here we are swapping, that's the difference to #11  
      width = height;  
      height = tmp;  
      PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, width, height);
      BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
      try
      {
          /**
           * 解析转化后的图片，得到结果
           */
          rawResult = multiFormatReader.decodeWithState(bitmap);
      }
      catch (ReaderException re)
      {
          // continue
      }
      finally
      {
          multiFormatReader.reset();
      }

      if (rawResult != null)
      {
          long end = System.currentTimeMillis();
          Log.d(TAG, "Found barcode (" + (end - start) + " ms):\n"
                  + rawResult.toString());
          /**
           * 如果解析结果不为空，就是解析成功了，则发送成功消息，将结果放到message中
           */
          Message message = Message.obtain(activity.getHandler(),
                  R.id.decode_succeeded, rawResult);
          Bundle bundle = new Bundle();
          bundle.putParcelable(DecodeThread.BARCODE_BITMAP,
                  source.renderCroppedGreyscaleBitmap());
          message.setData(bundle);
          // Log.d(TAG, "Sending decode succeeded message...");
          message.sendToTarget();
      }
      else
      {
          /**
           *  否则发送失败message
           */
          Message message = Message.obtain(activity.getHandler(),
                  R.id.decode_failed);
          message.sendToTarget();
      }
  }

}
